The Futurians, time-travelers from the 23rd century, arrive in Japan to warn them of the nation's destruction under Godzilla. They offer to help erase Godzilla from history by preventing his creation. With Godzilla seemingly gone, a new monster emerges as the Futurians' true intentions are revealed.
| Actor | Role |
|---|---|
 Katsuhiko SasakiProfessor Mazaki | Professor Mazaki |
 Kosuke ToyoharaKenichiro Terasawa | Kenichiro Terasawa |
 Anna NakagawaEmmy Kano | Emmy Kano |
 Megumi OdakaMiki Saegusa | Miki Saegusa |
 Akiji KobayashiYuzo Tsuchiashi | Yuzo Tsuchiashi |
 Tokuma NishiokaTakehito Fujio | Takehito Fujio |
 Yoshio TsuchiyaBusinessman Yasuaki Shindo | Businessman Yasuaki Shindo |
 Kenji SaharaMinister Takayuki Segawa | Minister Takayuki Segawa |
 Koichi UedaFormer Lagos Island Soldier Ikehata | Former Lagos Island Soldier Ikehata |
 So YamamuraPrime Minister | Prime Minister |
| YYasunori YugeArmy Chief | Army Chief |
 Kiwako HaradaChiaki Moriyuma | Chiaki Moriyuma |
 Kenpachirō SatsumaGodzilla | Godzilla |
| ''Hurricane' Ryu HarikenKing Ghidorah | King Ghidorah |
| RRobert Scott FieldAndroid M-11 | Android M-11 |
| WWataru FukudaGodzillasaurus | Godzillasaurus |
 Jun'ichi YaoiGuest Commentator | Guest Commentator |
 Eizo KaimaiOriginal Godzilla (archive photo) (uncredited) | Original Godzilla (archive photo) (uncredited) |